Hi, 

Might recommend downloading the FREE graph software at

http://www.padowan.dk.com

Understand you are to find a-c algebraicly, however, there is nothing

like a picture  to bring understanding, my opinion.

 y = -x^2 + 4x    y = 0 whe x = 0 and x = 4 when y = 0  (x^2 = 4x, x = 4)

 y = -(x-2)^2 + 4  Vertex form Vertex (2,4)

a. How high does the shell go? 4km

 b. How far has the shell traveled horizontally when it reaches its maximum height? 2 km

 c. How far from its firing point does the shell land? 4km





 

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